Π-type reconfigurable coupler based on a complementary tunable method

Abstract

A complementary tunable method is proposed based on the Hybrid coupler. The odd-even mode analysis shows that the method can achieve continuously tunable power division ratio by changing two $50/\sqrt{2}\mathrm{\Omega }$ transmission lines in the circuit, and it can achieve larger tunable range by improving the complementary tunable method based on the cascaded Hybrid coupler. Using the improved method, a novel π-type reconfigurable coupler, which works at 2.45 GHz, is designed by replacing $50/\sqrt{2}\mathrm{\Omega }$ transmission lines with π-type circuit. The power division ratio of the fabricated reconfigurable coupler is changed in the range of −20.5–21.3 dB, with the bias voltage being 0∼6 V; meanwhile, the isolation and return loss are above 20 dB.

KEYWORDS:

• Hybrid coupler
• power division ratio
• reconfigurable coupler
• varistor diode

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Chongqing Natural Science Foundation Project [grant number cstc2018jcyjAX0014].

Notes on contributors

Peng Lei

Lei Peng (1994 -), master of Chongqing University of Posts and telecommunications, majoring in microwave / millimeter wave integrated circuit design and RF devices.